Posted by Travis W on November 21, 2012 at 17:28:14 from (209.169.110.253):
HELP!!!!
1949 model A John Deere. This tractor has had a lot of work done to it. We"ve rebuilt the carb, and have checked it about half a dozen times. I got it started, ran it for 10 minutes....ran beautifully. Turned it off to "share the moment" and can"t get it started again. It is getting air, it is getting fuel (we think) appropriately. Magneto is sparking. That"s all there is on it, so I have no idea why she won"t fire again. I wonder if it is possible for the magneto to not spark hot enough? I have NEVER had the magneto off - and like I said, it ran great for a short while.
I"m seriously almost ready to throw in the towel. I followed advice from a previous post (My Poppin" Johnny Won"t Pop)- the carb is not leaking back through to the engine. I thought the air breather might be completely plugged up, so I took all lines off the left-hand side. I tried ether today....I got a "pop" and every now and then a "pop-pop" - but that was it. Worked on it on and off for over 5 hours today. Turns over great.
I adjusted the float on the carb to 1/2" from the top of the bowl as per a manual for Marvel Scheblers that I pulled down. Verified it is functioning appropriately with fuel. Have tried multiple idle and load settings, including those from the book (1 1/2 to 2 turns for idle; 1 turn for load). I had a friend over that works on airplanes for a living.....he"s as stumped as I am. I surrender, oh ye gurus....
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